3.5x5.5". The 1907 Dietsche Chicago Cubs set was issued alongside a Detroit Tigers set due to the popularity of their matchup in the 1907 World Series. The Cubs players  are considered to be considerably rarer than the Tigers players.

Mordecai Brown was an American Major League Baseball pitcher and manager during the first two decades of the 20th century (known as the "dead-ball era"). Due to a farm-machinery accident in his youth (April 17, 1888), Brown lost parts of two fingers on his right hand, and in the process gained a colorful nickname. He was a two time World Series Champion in 1907 and 1908. Mordecai Brown was inducted into the National Baseball Hall Of Fame in 1949. The PSA population report indicates one of only 11 ever graded.